The following are all correct: There is much air pollution in Beijing. There's a great deal of air pollution in Beijing. ("A great deal" is better English than "a lot of", although "a lot of" is very common.) There's too much air pollution in Beijing. (There's more air pollution than is safe for people.) There isn't much air pollution on Vancouver Island. There isn't too much air pollution on Vancouver Island. (Here, "there isn't too much" is the same as "there isn't very much". Both are the same as saying "There isn't much air pollution on Vancouver Island.)